Technical Feature Value Ro 100Ω ± 0.05Ω Alpha 0.003850 ± 0.000005 Standard IEC 60751 Stability 0.010Ω/ year Recommended Current 1mA Self Heating at 1mA 0.004°C Calibration Optional UKAS Calibration at extra cost. See table for typical uncertainties. Connection 4 Wire Max. Handle Temperature 80°C

</tr Model Temperature Range Sheath Diameter Sheath Length Sensing Length Handle General Purpose 935-14-61 −50°C to 250°C 4 mm 300 mm 6 mm 19 × 120 mm 935-14-112 −50°C to 450°C 4 mm 300 mm 6 mm No Handle 935-14-98 −50°C to 350°C 4 mm 300 mm 8 mm No handle 935-14-116 −100°C to 450°C 6 mm 350 mm 25 mm 19 × 120 mm 935-14-98 −50°C to 350°C 4 mm 300 mm 8 mm No handle Low Temperature PRTs 935-14-115 −196°C to 100°C 4 mm 300 mm 8 mm Ø 17.5 mm 935-14-13 −196°C to 250°C 6 mm 350 mm 25 mm 25 × 115 mm 935-14-113 −100°C to 250°C 6 mm 350 mm 25 mm 19 × 120 mm High Temperature PRTs 935-14-72 −50°C to 670°C 6 mm 375 mm 25 mm No handle Laboratory Working Standards Longer probes designed primarily for laboratory use. The low- and high-temperature models can be used as a complementary pair where coverage from −200°C to 660°C is required. 935-14-95L −200°C to 165°C 6 mm 480 mm 25 mm 25 × 115 mm 935-14-95H −80°C to 670°C 6 mm 480 mm 25 mm 19 × 120 mm Angled Probes 935-14-82 −50°C to 250°C 4 mm 165 mm 6 mm Angled 935-14-85 −50°C to 250°C 6 mm 385 mm 25 mm Angled 935-14-75 −50°C to 250°C 4 mm 213 mm 6 mm 90° 935-14-79 0°C to 660°C 6 mm 199 mm 25 mm 90°

Semi Standard PRTs Data Sheet (PDF) NEW: 935-14-154 (−196°C to 100°C, 4 mm diameter) | Datasheet (PDF)

Model 935-14-154 Semi Standard PRT in Use

DESCRIPTION

Isotech Semi-Standard Platinum Resistance Thermometers are designed for applications requiring high accuracy, good long-term stability and greater robustness than a traditional Standard Platinum Resistance Thermometer (SPRT). They are suitable for both laboratory and field use, including as working standards in dry blocks and liquid baths, or as high-accuracy sensors used with precision temperature readouts.

All models are metal sheathed, making them less fragile and more practical for routine calibration work than laboratory SPRTs, while still offering excellent measurement performance.

Each thermometer uses a handmade, coil-wound Pt100 platinum sensing element selected for high accuracy, low drift and long-term stability. The probes are available in a range of lengths, diameters and temperature ranges to suit different calibration applications.

Angled and 90° versions are also available for use with Isotech Portable Temperature Calibrators. These provide additional clearance where a unit under test has a terminal head or connection housing that would otherwise obstruct a straight reference thermometer. For best measurement performance, these probes should be calibrated as part of the portable calibrator system.

Isotech’s UKAS accredited laboratory can calibrate Semi-Standard PRTs to low uncertainties across their operating range. The calibration should be selected to suit the required temperature range, measurement uncertainty and application, and Isotech can advise on the most appropriate calibration service.

SPECIFICATION

Technical Feature	Value
Ro	100Ω ± 0.05Ω
Alpha	0.003850 ± 0.000005
Standard	IEC 60751
Stability	0.010Ω/ year
Recommended Current	1mA
Self Heating at 1mA	0.004°C
Calibration	Optional UKAS Calibration at extra cost. See table for typical uncertainties.
Connection	4 Wire
Max. Handle Temperature	80°C

Model Types

</tr

Model	Temperature Range	Sheath Diameter	Sheath Length	Sensing Length	Handle
General Purpose
935-14-61	−50°C to 250°C	4 mm	300 mm	6 mm	19 × 120 mm
935-14-112	−50°C to 450°C	4 mm	300 mm	6 mm	No Handle
935-14-98	−50°C to 350°C	4 mm	300 mm	8 mm	No handle
935-14-116	−100°C to 450°C	6 mm	350 mm	25 mm	19 × 120 mm
935-14-98	−50°C to 350°C	4 mm	300 mm	8 mm	No handle
Low Temperature PRTs
935-14-115	−196°C to 100°C	4 mm	300 mm	8 mm	Ø 17.5 mm
935-14-13	−196°C to 250°C	6 mm	350 mm	25 mm	25 × 115 mm
935-14-113	−100°C to 250°C	6 mm	350 mm	25 mm	19 × 120 mm
High Temperature PRTs
935-14-72	−50°C to 670°C	6 mm	375 mm	25 mm	No handle
Laboratory Working Standards
Longer probes designed primarily for laboratory use. The low- and high-temperature models can be used as a complementary pair where coverage from −200°C to 660°C is required.
935-14-95L	−200°C to 165°C	6 mm	480 mm	25 mm	25 × 115 mm
935-14-95H	−80°C to 670°C	6 mm	480 mm	25 mm	19 × 120 mm
Angled Probes
935-14-82	−50°C to 250°C	4 mm	165 mm	6 mm	Angled
935-14-85	−50°C to 250°C	6 mm	385 mm	25 mm	Angled
935-14-75	−50°C to 250°C	4 mm	213 mm	6 mm	90°
935-14-79	0°C to 660°C	6 mm	199 mm	25 mm	90°

Typical Uncertainties with Optional UKAS Calibration

Temperature	935-14-95L	935-14-61	935-14-13	935-14-16 935-14-116	935-14-95H 935-14-72
−196°C	25 mK	N/A	25 mK	N/A	N/A
−80°C	20 mK	N/A	20 mK	25 mK	25 mK
−50°C	15 mK	15 mK	15 mK	20 mK	20 mK
0°C	10 mK	10 mK	10 mK	15 mK	15 mK
50°C	10 mK	10 mK	10 mK	15 mK	15 mK
156°C	10 mK	10 mK	10 mK	20 mK	20 mK
232°C	N/A	15 mK	15 mK	25 mK	25 mK
420°C	N/A	N/A	N/A	40 mK	40 mK
550°C	N/A	N/A	N/A	N/A	50 mK
660°C	N/A	N/A	N/A	N/A	50 mK

Typical Uncertainties with Optional Isotech UKAS Accredited Calibration, k = 2.
The above uncertainties do not include long-term drift.
Typical stability of a correctly used Semi-Standard PRT is 0.01°C/year at 0°C.
The actual uncertainty of an individual probe is determined at the time of calibration.

Downloads

Semi Standard PRTS

Q: DESCRIPTION

Isotech Semi-Standard Platinum Resistance Thermometers are designed for applications requiring high accuracy, good long-term stability and greater robustness than a traditional Standard Platinum Resistance Thermometer (SPRT). They are suitable for both laboratory and field use, including as working standards in dry blocks and liquid baths, or as high-accuracy sensors used with precision temperature readouts. All models are metal sheathed, making them less fragile and more practical for routine calibration work than laboratory SPRTs, while still offering excellent measurement performance. Each thermometer uses a handmade, coil-wound Pt100 platinum sensing element selected for high accuracy, low drift and long-term stability. The probes are available in a range of lengths, diameters and temperature ranges to suit different calibration applications. Angled and 90° versions are also available for use with Isotech Portable Temperature Calibrators. These provide additional clearance where a unit under test has a terminal head or connection housing that would otherwise obstruct a straight reference thermometer. For best measurement performance, these probes should be calibrated as part of the portable calibrator system. Isotech’s UKAS accredited laboratory can calibrate Semi-Standard PRTs to low uncertainties across their operating range. The calibration should be selected to suit the required temperature range, measurement uncertainty and application, and Isotech can advise on the most appropriate calibration service.

Q: Model Types

</tr Model Temperature Range Sheath Diameter Sheath Length Sensing Length Handle General Purpose 935-14-61 −50°C to 250°C 4 mm 300 mm 6 mm 19 × 120 mm 935-14-112 −50°C to 450°C 4 mm 300 mm 6 mm No Handle 935-14-98 −50°C to 350°C 4 mm 300 mm 8 mm No handle 935-14-116 −100°C to 450°C 6 mm 350 mm 25 mm 19 × 120 mm 935-14-98 −50°C to 350°C 4 mm 300 mm 8 mm No handle Low Temperature PRTs 935-14-115 −196°C to 100°C 4 mm 300 mm 8 mm Ø 17.5 mm 935-14-13 −196°C to 250°C 6 mm 350 mm 25 mm 25 × 115 mm 935-14-113 −100°C to 250°C 6 mm 350 mm 25 mm 19 × 120 mm High Temperature PRTs 935-14-72 −50°C to 670°C 6 mm 375 mm 25 mm No handle Laboratory Working Standards Longer probes designed primarily for laboratory use. The low- and high-temperature models can be used as a complementary pair where coverage from −200°C to 660°C is required. 935-14-95L −200°C to 165°C 6 mm 480 mm 25 mm 25 × 115 mm 935-14-95H −80°C to 670°C 6 mm 480 mm 25 mm 19 × 120 mm Angled Probes 935-14-82 −50°C to 250°C 4 mm 165 mm 6 mm Angled 935-14-85 −50°C to 250°C 6 mm 385 mm 25 mm Angled 935-14-75 −50°C to 250°C 4 mm 213 mm 6 mm 90° 935-14-79 0°C to 660°C 6 mm 199 mm 25 mm 90°

Q: Typical Uncertainties with Optional UKAS Calibration

Temperature 935-14-95L 935-14-61 935-14-13 935-14-16 935-14-116 935-14-95H 935-14-72 −196°C 25 mK N/A 25 mK N/A N/A −80°C 20 mK N/A 20 mK 25 mK 25 mK −50°C 15 mK 15 mK 15 mK 20 mK 20 mK 0°C 10 mK 10 mK 10 mK 15 mK 15 mK 50°C 10 mK 10 mK 10 mK 15 mK 15 mK 156°C 10 mK 10 mK 10 mK 20 mK 20 mK 232°C N/A 15 mK 15 mK 25 mK 25 mK 420°C N/A N/A N/A 40 mK 40 mK 550°C N/A N/A N/A N/A 50 mK 660°C N/A N/A N/A N/A 50 mK Typical Uncertainties with Optional Isotech UKAS Accredited Calibration, k = 2. The above uncertainties do not include long-term drift. Typical stability of a correctly used Semi-Standard PRT is 0.01°C/year at 0°C. The actual uncertainty of an individual probe is determined at the time of calibration.

Q: Downloads

Semi Standard PRTs Data Sheet (PDF) NEW: 935-14-154 (−196°C to 100°C, 4 mm diameter) | Datasheet (PDF)

High-stability reference thermometers for laboratory and field calibration.

Isotech Semi-Standard Platinum Resistance Thermometers are high-stability reference probes designed for laboratory and field calibration. They are ideal for use as working standards in dry blocks and liquid baths, or as high-accuracy sensors with precision readouts such as the Isotech milliK.

High accuracy from −200°C to 670°C
Working standards for dry blocks and liquid baths
Straight and angled models for laboratory and field use

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DESCRIPTION

SPECIFICATION

Model Types

Typical Uncertainties with Optional UKAS Calibration

Downloads

Semi Standard PRTS

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